U.S. patent application number 16/316571 was filed with the patent office on 2020-05-07 for method of transmitting and receiving data in wireless communication system and apparatus therefor.
The applicant listed for this patent is LG Electronics Inc.. Invention is credited to Jiwon KANG, Hyungtae KIM, Kijun KIM, Changhwan PARK, Yunjung YI, Sukhyon YOON.
Application Number | 20200146035 16/316571 |
Document ID | / |
Family ID | 65040284 |
Filed Date | 2020-05-07 |
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United States Patent
Application |
20200146035 |
Kind Code |
A1 |
KIM; Hyungtae ; et
al. |
May 7, 2020 |
METHOD OF TRANSMITTING AND RECEIVING DATA IN WIRELESS COMMUNICATION
SYSTEM AND APPARATUS THEREFOR
Abstract
This specification provides a method of transmitting and
receiving data in a wireless communication system and an apparatus
therefor. Specifically, a method for transmitting and receiving
data in a wireless communication system by a user equipment
includes receiving downlink control information from a base station
and receiving downlink data from the base station through a
downlink shared channel configured based on the downlink control
information, wherein when the downlink data is broadcasted, a
bundling size for the downlink shared channel is configured as a
pre-defined value.
Inventors: |
KIM; Hyungtae; (Seoul,
KR) ; KANG; Jiwon; (Seoul, KR) ; KIM;
Kijun; (Seoul, KR) ; PARK; Changhwan; (Seoul,
KR) ; YOON; Sukhyon; (Seoul, KR) ; YI;
Yunjung; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG Electronics Inc. |
Seoul |
|
KR |
|
|
Family ID: |
65040284 |
Appl. No.: |
16/316571 |
Filed: |
July 23, 2018 |
PCT Filed: |
July 23, 2018 |
PCT NO: |
PCT/KR2018/008282 |
371 Date: |
January 9, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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62535949 |
Jul 23, 2017 |
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62555653 |
Sep 8, 2017 |
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62566455 |
Oct 1, 2017 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 5/0044 20130101;
H04W 72/12 20130101; H04L 5/00 20130101; H04W 72/1273 20130101;
H04W 72/1289 20130101; H04L 5/0092 20130101; H04W 72/04 20130101;
H04L 5/0039 20130101 |
International
Class: |
H04W 72/12 20060101
H04W072/12; H04L 5/00 20060101 H04L005/00 |
Claims
1. A method for transmitting and receiving data in a wireless
communication system by a user equipment, the method comprising:
receiving downlink control information from a base station, and
receiving, from the base station, downlink data through a downlink
shared channel configured based on the downlink control
information, wherein, when the downlink data is broadcasted, a
bundling size for the downlink shared channel is configured as a
pre-defined value, wherein, when the downlink data is not
broadcasted, the bundling size for the downlink shared channel is
configured as a specific number of physical resource blocks or a
size of a frequency resource region allocated to the user
equipment, and wherein a value representing the specific number of
physical resource blocks is included in a bundling size set
pre-configured for the downlink shared channel.
2. The method of claim 1, wherein the pre-defined value is two
physical resource blocks (PRBs).
3. (canceled)
4. (canceled)
5. The method of claim 1, wherein, when the size of the frequency
resource region is greater than a value pre-configured for the user
equipment, the bundling size for the downlink shared channel is
configured as the size of the frequency resource region.
6. The method of claim 5, wherein the pre-configured value is
configured through higher layer signaling by the base station.
7. The method of claim 5, wherein the frequency resource region is
configured as physical resource blocks contiguous in a frequency
axis.
8. The method of claim 1, wherein the pre-configured bundling size
set is configured based on the size of the frequency resource
region.
9. The method of claim 2, wherein, when the downlink data is
broadcasted, the downlink data comprises a system information block
for the user equipment.
10. A user equipment transmitting and receiving data in a wireless
communication system, comprising: a radio frequency (RF) module for
transmitting and receiving radio signals, and a processor
functionally connected to the RF module, wherein the processor is
configured to: receive downlink control information from a base
station, and receive, from a base station, downlink data through a
downlink shared channel configured based on the downlink control
information, and wherein, when the downlink data is broadcasted, a
bundling size for the downlink shared channel is configured as a
pre-defined value, wherein, when the downlink data is not
broadcasted, the bundling size for the downlink shared channel is
configured as a specific number of physical resource blocks or a
size of a frequency resource region allocated to the user
equipment, and wherein a value representing the specific number of
physical resource blocks is included in a bundling size set
pre-configured for the downlink shared channel.
11. The user equipment of claim 10, wherein the pre-defined value
is two physical resource blocks (PRBs).
12. (canceled)
13. (canceled)
14. The user equipment of claim 10, wherein when the size of the
frequency resource region is greater than a value pre-configured
for the user equipment, the bundling size for the downlink shared
channel is configured as the size of the frequency resource
region.
15. The user equipment of claim 14, wherein the frequency resource
region is configured as physical resource blocks contiguous in a
frequency axis.
Description
TECHNICAL FIELD
[0001] The present invention relates to a wireless communication
system and, more particularly, to a method for transmitting and
receiving data and an apparatus supporting the same.
BACKGROUND ART
[0002] Mobile communication systems have been generally developed
to provide voice services while guaranteeing user mobility. Such
mobile communication systems have gradually expanded their coverage
from voice services through data services up to high-speed data
services. However, as current mobile communication systems suffer
resource shortages and users demand even higher-speed services,
development of more advanced mobile communication systems is
needed.
[0003] The requirements of the next-generation mobile communication
system may include supporting huge data traffic, a remarkable
increase in the transfer rate of each user, the accommodation of a
significantly increased number of connection devices, very low
end-to-end latency, and high energy efficiency. To this end,
various techniques, such as small cell enhancement, dual
connectivity, massive multiple input multiple output (MIMO),
in-band full duplex, non-orthogonal multiple access (NOMA),
supporting super-wide band, and device networking, have been
researched.
DISCLOSURE
Technical Problem
[0004] This specification proposes a method of transmitting and
receiving data in a wireless communication system and an apparatus
therefor.
[0005] In relation to the proposal, this specification proposes a
method for configuring bundling for a downlink shared channel
(e.g., PDSCH) and an apparatus therefor.
[0006] Specifically, this specification proposes a method for
configuring and indicting a bundling size set, bundling size and/or
bundling type for a downlink shared channel and an apparatus
therefor.
[0007] Technical objects to be achieved in the present invention
are not limited to the above-described technical objects, and other
technical objects not described above may be evidently understood
by a person having ordinary skill in the art to which the present
invention pertains from the following description.
Technical Solution
[0008] In a method for transmitting and receiving data in a
wireless communication system by a user equipment according to an
embodiment of the present invention, the method includes receiving,
from a base station, downlink control information and receiving,
from the base station, downlink data through a downlink shared
channel configured based on the downlink control information,
wherein, when the downlink data is broadcasted, a bundling size for
the downlink shared channel may be configured as a pre-defined
value.
[0009] In the method according to an embodiment of the present
invention, the pre-defined value may be two physical resource
blocks (PRBs).
[0010] However, in the method, when the downlink data may be not
broadcasted, the bundling size for the downlink shared channel may
be configured as a specific number of physical resource blocks or
the size of a frequency resource region allocated to the user
equipment. In this case, a value indicating the specific number of
physical resource blocks may be included in a bundling size set
which is pre-configured for the downlink shared channel.
Furthermore, when the size of the frequency resource region is
greater than a value which is pre-configured for the user
equipment, the bundling size for the downlink shared channel may be
configured as the size of the frequency resource region. The
pre-configured value may be configured through higher layer
signaling by the base station. Furthermore, the frequency resource
region may be configured as physical resource blocks contiguous in
a frequency axis.
[0011] Furthermore, the pre-configured bundling size set may be
configured based on the size of the frequency resource region.
[0012] Furthermore, when the downlink data is broadcasted, the
downlink data may include a system information block for the user
equipment.
[0013] In a user equipment transmitting and receiving data in a
wireless communication system according to an embodiment of the
present invention, the user equipment includes a radio frequency
(RF) module for transmitting and receiving radio signals and a
processor functionally connected to the RF module. The processor
may be configured to receive, from a base station, downlink control
information and receive, from a base station, downlink data through
a downlink shared channel configured based on the downlink control
information. When the downlink data is broadcasted, a bundling size
for the downlink shared channel may be configured as a pre-defined
value.
[0014] In the user equipment according to an embodiment of the
present invention, the pre-defined value may be two physical
resource blocks (PRBs).
[0015] However, in the user equipment, when the downlink data is
not broadcasted, the bundling size for the downlink shared channel
may be configured as a specific number of physical resource blocks
or the size of a frequency resource region allocated to the user
equipment. In this case, a value indicating the specific number of
physical resource blocks may be included in a bundling size set
which is pre-configured for the downlink shared channel.
Furthermore, when the size of the frequency resource region is
greater than a value which is pre-configured for the user
equipment, the bundling size for the downlink shared channel may be
configured as the size of the frequency resource region.
Furthermore, the frequency resource region may be configured as
physical resource blocks contiguous in a frequency axis.
Advantageous Effects
[0016] In accordance with an embodiment of the present invention,
there are effects in that overhead of control information can be
reduced and a bundling size can be configured.
[0017] Furthermore, in accordance with an embodiment of the present
invention, there is an effect in that various bundling sizes can be
configured or indicated through only a small amount of control
information.
[0018] Furthermore, in accordance with an embodiment of the present
invention, there is an effect in that an efficient bundling
operation can be supported by taking into consideration tradeoff
between precoding flexibility and the accuracy of channel
estimation.
[0019] Effects which may be obtained in the present invention are
not limited to the above-described effects, and other technical
effects not described above may be evidently understood by a person
having ordinary skill in the art to which the present invention
pertains from the following description.
DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings, which are included herein as a
part of a description in order to help understanding of the present
disclosure, provide embodiments of the present disclosure, and
describe the technical features of the present disclosure with the
description below.
[0021] FIG. 1 is a diagram illustrating an example of an overall
structure of a new radio (NR) system to which a method proposed by
the present disclosure may be implemented.
[0022] FIG. 2 illustrates a relationship between a uplink (UL)
frame and a downlink (DL) frame in a wireless communication system
to which a method proposed by the present disclosure may be
implemented.
[0023] FIG. 3 illustrates an example of a resource grid supported
in a wireless communication system to which a method proposed by
the present disclosure may be implemented.
[0024] FIG. 4 illustrates examples of resource grids for each
antenna port and numerology to which a method proposed in this
specification may be applied.
[0025] FIG. 5 is a diagram illustrating an example of a
self-contained subframe structure in a wireless communication
system to which the present disclosure may be implemented.
[0026] FIG. 6 illustrates an operational flowchart of a user
equipment transmitting and receiving data in a wireless
communication system to which a method proposed in this
specification may be applied.
[0027] FIG. 7 illustrates a block diagram of a wireless
communication apparatus according to an embodiment of the present
invention.
[0028] FIG. 8 illustrates a block diagram of a communication
apparatus according to an embodiment of the present invention.
MODE FOR INVENTION
[0029] Hereinafter, some embodiments of the present disclosure are
described in detail with reference to the accompanying drawings. A
detailed description to be disclosed along with the accompanying
drawings is intended to describe some exemplary embodiments of the
present disclosure and is not intended to describe a sole
embodiment of the present disclosure. The following detailed
description includes more details in order to provide full
understanding of the present disclosure. However, those skilled in
the art will understand that the present disclosure may be
implemented without such more details.
[0030] In some cases, in order to avoid making the concept of the
present disclosure vague, known structures and devices are omitted
or may be shown in a block diagram form based on the core functions
of each structure and device.
[0031] In the present disclosure, a base station has the meaning of
a terminal node of a network over which the base station directly
communicates with a terminal. In this document, a specific
operation that is described to be performed by a base station may
be performed by an upper node of the base station according to
circumstances. That is, it is evident that in a network including a
plurality of network nodes including a base station, various
operations performed for communication with a terminal may be
performed by the base station or other network nodes other than the
base station. The base station (BS) may be substituted with another
term, such as a fixed station, a Node B, an eNB (evolved-NodeB), a
base transceiver system (BTS), an access point (AP), or next
generation NB (general NB, gNodeB, gNB). Furthermore, the terminal
may be fixed or may have mobility and may be substituted with
another term, such as user equipment (UE), a mobile station (MS), a
user terminal (UT), a mobile subscriber station (MSS), a subscriber
station (SS), an advanced mobile station (AMS), a wireless terminal
(WT), a machine-type communication (MTC) device, a
machine-to-Machine (M2M) device, or a device-to-device (D2D)
device.
[0032] Hereinafter, downlink (DL) means communication from a base
station to UE, and uplink (UL) means communication from UE to a
base station. In DL, a transmitter may be part of a base station,
and a receiver may be part of UE. In UL, a transmitter may be part
of UE, and a receiver may be part of a base station.
[0033] Specific terms used in the following description have been
provided to help understanding of the present disclosure, and the
use of such specific terms may be changed in various forms without
departing from the technical sprit of the present disclosure.
[0034] The following technologies may be used in a variety of
wireless communication systems, such as code division multiple
access (CDMA), frequency division multiple access (FDMA), time
division multiple access (TDMA), orthogonal frequency division
multiple access (OFDMA), single carrier frequency division multiple
access (SC-FDMA), and non-orthogonal multiple access (NOMA). CDMA
may be implemented using a radio technology, such as universal
terrestrial radio access (UTRA) or CDMA2000. TDMA may be
implemented using a radio technology, such as global system for
mobile communications (GSM)/general packet radio service
(GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be
implemented using a radio technology, such as Institute of
electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE
802.16 (WiMAX), IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is part
of a universal mobile telecommunications system (UMTS). 3rd
generation partnership project (3GPP) Long term evolution (LTE) is
part of an evolved UMTS (E-UMTS) using evolved UMTS terrestrial
radio access (E-UTRA), and it adopts OFDMA in downlink and adopts
SC-FDMA in uplink. LTE-advanced (LTE-A) is the evolution of 3GPP
LTE.
[0035] Embodiments of the present disclosure may be supported by
the standard documents disclosed in at least one of IEEE 802, 3GPP,
and 3GPP2, that is, radio access systems. That is, steps or
portions that belong to the embodiments of the present disclosure
and that are not described in order to clearly expose the technical
spirit of the present disclosure may be supported by the documents.
Furthermore, all terms disclosed in this document may be described
by the standard documents.
[0036] In order to more clarify a description, 3GPP LTE/LTE-A/New
RAT (NR) is chiefly described, but the technical characteristics of
the present disclosure are not limited thereto.
Definition of Terms
[0037] eLTE eNB: An eLTE eNB is an evolution of an eNB that
supports a connection for an EPC and an NGC.
[0038] gNB: A node for supporting NR in addition to a connection
with an NGC
[0039] New RAN: A radio access network that supports NR or E-UTRA
or interacts with an NGC
[0040] Network slice: A network slice is a network defined by an
operator so as to provide a solution optimized for a specific
market scenario that requires a specific requirement together with
an inter-terminal range.
[0041] Network function: A network function is a logical node in a
network infra that has a well-defined external interface and a
well-defined functional operation.
[0042] NG-C: A control plane interface used for NG2 reference point
between new RAN and an NGC
[0043] NG-U: A user plane interface used for NG3 reference point
between new RAN and an NGC
[0044] Non-standalone NR: A deployment configuration in which a gNB
requires an LTE eNB as an anchor for a control plane connection to
an EPC or requires an eLTE eNB as an anchor for a control plane
connection to an NGC
[0045] Non-standalone E-UTRA: A deployment configuration an eLTE
eNB requires a gNB as an anchor for a control plane connection to
an NGC.
[0046] User plane gateway: A terminal point of NG-U interface
General System
[0047] FIG. 1 is a diagram illustrating an example of an overall
structure of a new radio (NR) system to which a method proposed by
the present disclosure may be implemented.
[0048] Referring to FIG. 1, an NG-RAN is composed of gNBs that
provide an NG-RA user plane (new AS sublayer/PDCP/RLC/MAC/PHY) and
a control plane (RRC) protocol terminal for a UE (User
Equipment).
[0049] The gNBs are connected to each other via an Xn
interface.
[0050] The gNBs are also connected to an NGC via an NG
interface.
[0051] More specifically, the gNBs are connected to a Access and
Mobility Management Function (AMF) via an N2 interface and a User
Plane Function (UPF) via an N3 interface.
New Rat (NR) Numerology and Frame Structure
[0052] In the NR system, multiple numerologies may be supported.
The numerologies may be defined by subcarrier spacing and a CP
(Cyclic Prefix) overhead. Spacing between the plurality of
subcarriers may be derived by scaling basic subcarrier spacing into
an integer N (or .mu.). In addition, although a very low subcarrier
spacing is assumed not to be used at a very high subcarrier
frequency, a numerology to be used may be selected independent of a
frequency band.
[0053] In addition, in the NR system, a variety of frame structures
according to the multiple numerologies may be supported.
[0054] Hereinafter, an Orthogonal Frequency Division Multiplexing
(OFDM) numerology and a frame structure, which may be considered in
the NR system, will be described.
[0055] A plurality of OFDM numerologies supported in the NR system
may be defined as in Table 1.
TABLE-US-00001 TABLE 1 .mu. .DELTA.f = 2.sup..mu. 15 [kHz] Cyclic
prefix 0 15 Normal 1 30 Normal 2 60 Normal, Extended 3 120 Normal 4
240 Normal 5 480 Normal
[0056] Regarding a frame structure in the NR system, a size of
various fields in the time domain is expressed as a multiple of a
time unit of T.sub.s=1/(.DELTA.f.sub.maxN.sub.f). In this case,
.DELTA.f.sub.max=48010.sup.3, and N.sub.f=4096. DL and UL
transmission is configured as a radio frame having a section of
T.sub.f=(.DELTA.f.sub.max N.sub.f/100)T.sub.s=10 ms. The radio
frame is composed of ten subframes each having a section of
T.sub.sf=(.DELTA.f.sub.max N.sub.f/1000)T.sub.s=1 ms. In this case,
there may be a set of UL frames and a set of DL frames.
[0057] FIG. 2 illustrates a relationship between a UL frame and a
DL frame in a wireless communication system to which a method
proposed by the present disclosure may be implemented.
[0058] As illustrated in FIG. 2, a UL frame number I from a user
equipment (UE) needs to be transmitted T.sub.TA=N.sub.TAT.sub.s
before the start of a corresponding DL frame in the UE.
[0059] Regarding the numerology .mu., slots are numbered in
ascending order of n.sub.s.sup..mu..di-elect cons.{0, . . . ,
N.sub.subframe.sup.slots, .mu.-1} in a subframe, and in ascending
order of n.sub.s,f.sup..mu..di-elect cons.{0, . . . ,
N.sub.frame.sup.slots, .mu.-1} in a radio frame. One slot is
composed of continuous OFDM symbols of N.sub.symb.sup..mu., and
N.sub.symb.sup..mu. is determined depending on a numerology in use
and slot configuration. The start of slots n.sub.s.sup..mu. in a
subframe is temporally aligned with the start of OFDM symbols
n.sub.s.sup..mu.N.sub.symb.sup..mu. in the same subframe.
[0060] Not all UEs are able to transmit and receive at the same
time, and this means that not all OFDM symbols in a DL slot or an
UL slot are available to be used.
[0061] Table 2 shows the number of OFDM symbols per slot for a
normal CP in the numerology .mu., and Table 3 shows the number of
OFDM symbols per slot for an extended CP in the numerology
.mu..
TABLE-US-00002 TABLE 2 Slot configuration 0 1 .mu.
N.sub.symb.sup..mu. N.sub.frame.sup.slots, .mu.
N.sub.subframe.sup.slots, .mu. N.sub.symb.sup..mu.
N.sub.frame.sup.slots, .mu. N.sub.subframe.sup.slots, .mu. 0 14 10
1 7 20 2 1 14 20 2 7 40 4 2 14 40 4 7 80 8 3 14 80 8 -- -- -- 4 14
160 16 -- -- -- 5 14 320 32 -- -- --
TABLE-US-00003 TABLE 3 Slot configuration 0 1 .mu.
N.sub.symb.sup..mu. N.sub.frame.sup.slots, .mu.
N.sub.subframe.sup.slots, .mu. N.sub.symb.sup..mu.
N.sub.frame.sup.slots, .mu. N.sub.subframe.sup.slots, .mu. 0 12 10
1 6 20 2 1 12 20 2 6 40 4 2 12 40 4 6 80 8 3 12 80 8 -- -- -- 4 12
160 16 -- -- -- 5 12 320 32 -- -- --
NR Physical Resource
[0062] Regarding physical resources in the NR system, an antenna
port, a resource grid, a resource element, a resource block, a
carrier part, etc. may be considered.
[0063] Hereinafter, the above physical resources possible to be
considered in the NR system will be described in more detail.
[0064] First, regarding an antenna port, the antenna port is
defined such that a channel over which a symbol on one antenna port
is transmitted can be inferred from another channel over which a
symbol on the same antenna port is transmitted. When large-scale
properties of a channel received over which a symbol on one antenna
port can be inferred from another channel over which a symbol on
another antenna port is transmitted, the two antenna ports may be
in a QC/QCL (quasi co-located or quasi co-location) relationship.
Herein, the large-scale properties may include at least one of
delay spread, Doppler spread, Doppler shift, average gain, and
average delay.
[0065] FIG. 3 illustrates an example of a resource grid supported
in a wireless communication system to which a method proposed by
the present disclosure may be implemented.
[0066] Referring to FIG. 3, a resource grid is composed of
N.sub.RB.sup..mu.N.sub.sc.sup.RB subcarriers in a frequency domain,
each subframe composed of 14.2.mu. OFDM symbols, but the present
disclosure is not limited thereto.
[0067] In the NR system, a transmitted signal is described by one
or more resource grids, composed of
N.sub.RB.sup..mu.N.sub.sc.sup.RB subcarriers, and
2.sup..mu.N.sub.symb.sup.(.mu.) OFDM symbols Herein,
N.sub.RB.sup..mu..ltoreq.N.sub.RB.sup.max, .mu.. The above
N.sub.RB.sup.max, .mu. indicates the maximum transmission
bandwidth, and it may change not just between numerologies, but
between UL and DL.
[0068] In this case, as illustrated in FIG. 4, one resource grid
may be configured for the numerology .mu. and an antenna port
p.
[0069] FIG. 4 illustrates examples of resource grids for each
antenna port and numerology to which a method proposed in this
specification may be applied.
[0070] Each element of the resource grid for the numerology .mu.
and the antenna port p is indicated as a resource element, and may
be uniquely identified by an index pair (k,l). Herein, k=0, . . . ,
N.sub.RB.sup..mu.N.sub.sc.sup.RB-1 is an index in the frequency
domain, and l=0, . . . , 2.sup..mu.N.sub.symb.sup.(.mu.)-1
indicates a location of a symbol in a subframe. To indicate a
resource element in a slot, the index pair (k,l) is used. Herein,
l=0, . . . , N.sub.symb.sup..mu.-1.
[0071] The resource element (k,l) for the numerology .mu. and the
antenna port p corresponds to a complex value
a.sub.k,l.sup.(p,.mu.). When there is no risk of confusion or when
a specific antenna port or numerology is specified, the indexes p
and .mu. may be dropped and thereby the complex value may become
a.sub.k,l.sup.(p) or a.sub.k,l.
[0072] In addition, a physical resource block is defined as
N.sub.sc.sup.RB=12 continuous subcarriers in the frequency domain.
In the frequency domain, physical resource blocks may be numbered
from 0 to N.sub.RB.sup..mu.-1. At this point, a relationship
between the physical resource block number n.sub.PRB and the
resource elements (k,l) may be given as in Equation 1.
n PRB = k N sc RB [ Equation 1 ] ##EQU00001##
[0073] In addition, regarding a carrier part, a UE may be
configured to receive or transmit the carrier part using only a
subset of a resource grid. At this point, a set of resource blocks
which the UE is configured to receive or transmit are numbered from
0 to N.sub.URB.sup..mu.-1 in the frequency region.
Beam Management
[0074] In NR, beam management is defined as follows.
[0075] Beam management: a set of L1/L2 procedures for obtaining and
maintaining a set of TRP(s) and/or UE beams which may be used for
DL and UL transmission and reception, and includes at least the
following contents: [0076] Beam determination: an operation for a
TRP(s) or a UE to select its own transmission/reception beam.
[0077] Beam measurement: an operation for a TRP(s) or a UE to
measure the characteristics of a received beamforming signal.
[0078] Beam reporting: an operation for a UE to report information
of a beamformed signal based on beam measurement. [0079] Beam
sweeping: an operation of covering a space region using beams
transmitted and/or received at time intervals according to a
predetermined method.
[0080] Furthermore, a Tx/Rx beam correspondence in a TRP and a UE
is defined as follows. [0081] A Tx/Rx beam correspondence in a TRP
is maintained when at least one of the followings is satisfied.
[0082] A TRP may determine a TRP reception beam for uplink
reception based on the downlink measurement of a UE for one or more
Tx beams of the TRP. [0083] A TRP may determine a TRP Tx beam for
downlink transmission based on the uplink measurement of the TRP
for one or more Rx beams of the TRP. [0084] A Tx/Rx beam
correspondence in a UE is maintained when at least one of the
followings is satisfied. [0085] A UE may determine a UE Tx beam for
uplink transmission based on the downlink measurement of the UE for
one or more Rx beams of the UE. [0086] A UE may determine a UE Rx
beam for downlink reception based on the indication of a TRP based
on uplink measurement for one or more Tx beams. [0087] Capability
indication of UE beam correspondence-related information is
supported by a TRP.
[0088] The following DL L1/L2 beam management procedure is
supported within one or multiple TRPs.
[0089] P-1: it is used to enable UE measurement for a different TRP
Tx beam in order to support the selection of a TRP Tx beam/UE Rx
beam(s). [0090] In the case of beamforming in a TRP, in general,
intra/inter-TRP Tx beam sweep is included in a different beam set.
For beamforming in a UE, it typically includes UE Rx beam sweep
from a set of different beams.
[0091] P-2: UE measurement for a different TRP Tx beam is used to
change an inter/intra-TRP Tx beam(s).
[0092] P-3: if a UE uses beamforming, UE measurement for the same
TRP Tx beam is used to change a UE Rx beam.
[0093] Aperiodic reporting triggered by at least network is
supported in the P-1, P-2 and P-3-related operations.
[0094] UE measurement based on an RS for beam management (at least
CSI-RS) includes K (a total number of beams) beams. A UE reports
the measurement results of selected N Tx beams. In this case, N is
not essentially a fixed number. A procedure based on an RS for a
mobility object is not excluded. Reporting information includes
information indicating a measurement quantity for an N beam(s) when
at least N<K and N DL transmission beams. In particular, a UE
may report CSI-RS resource indicator (CRI) of N' with respect to
K'>1 non-zero-power (NZP) CSI-RS resources.
[0095] The following higher layer parameters may be configured in a
UE for beam management. [0096] N.gtoreq.1 reporting setting,
M.gtoreq.1 resource setting [0097] Links between reporting setting
and resource setting are established in an agreed CSI measurement
configuration. [0098] CSI-RS-based P-1 and P-2 are supported as
resource and reporting setting. [0099] P-3 may be supported
regardless of whether reporting setting is present or not. [0100]
Reporting setting including at least the following contents [0101]
Information indicating a selected beam [0102] L1 measurement
reporting [0103] Time domain operation (e.g., an aperiodic
operation, a periodic operation, a semi-persistent operation)
[0104] Frequency granularity when several frequency granularities
are supported [0105] Resource setting including at least the
following content [0106] Time domain operation (e.g., aperiodic
operation, periodic operation, semi-persistent operation) [0107] RS
type: at least NZP CSI-RS [0108] At least one CSI-RS resource set.
Each CSI-RS resource set includes CSI-RS resources (some parameters
of the K CSI-RS resources may be the same. For example, a port
number, a time domain operation, density and a period)
[0109] Furthermore, NR supports the following beam reporting by
taking into consideration L groups where L>1. [0110] Information
indicating a minimum group [0111] Measurement quantity for an N1
beam (L1 RSRP and CSI reporting support (if a CSI-RS is for CSI
acquisition)) [0112] Information indicating NI DL transmission
beams if applicable
[0113] Beam reporting based on a group, such as that described
above, may be configured in a UE unit. Furthermore, the group-based
beam reporting may be turned off in a UE unit (e.g., when L=1 or
NI=1).
[0114] NR supports that a UE can trigger a mechanism for recovery
from a beam failure.
[0115] A beam failure event occurs when quality of a beam pair link
of an associated control channel is sufficiently low (e.g., a
comparison with a threshold value, the timeout of an associated
timer). A mechanism for recovery from a beam failure (or obstacle)
is triggered when a beam obstacle occurs.
[0116] A network explicitly configures a UE having resources for
transmitting an UL signal for a recovery object. The configuration
of resources is supported at the place where a base station listens
from some or all of directions (e.g., random access region).
[0117] An UL transmission/resource reporting a beam obstacle may be
located at the same time instance as a PRACH (resource orthogonal
to a PRACH resource) and at a time instance different from that of
a PRACH (configurable with respect to a UE). The transmission of a
DL signal is supported so that a UE can monitor a beam in order to
identify new potential beams.
[0118] NR supports beam management regardless of a beam-related
indication. If a beam-related indication is provided, information
regarding a UE-side beamforming/reception procedure used for
CSI-RS-based measurement may be indicated with respect to the UE
through QCL. It is expected that parameters for delay, Doppler, an
average gain, etc. used in the LTE system and a spatial parameter
for beamforming in a reception stage will be added as QCL
parameters to be supported in NR. An angle of arrival-related
parameter may be included in the UE Rx beamforming viewpoint and/or
angle of departure-related parameters may be included in the base
station reception beamforming viewpoint. NR supports the use of the
same or different beams in a control channel and corresponding data
channel transmission.
[0119] For NR-PDCCH transmission supporting the robustness of beam
pair link blocking, a UE may configure an NR-PDCCH on M beam pair
links at the same time. In this case, a maximum value of M.gtoreq.1
and M may depend on at least the UE capability.
[0120] A UE may be configured to monitor an NR-PDCCH on a different
beam pair link(s) in different NR-PDCCH OFDM symbols. A parameter
related to a UE Rx beam configuration for monitoring an NR-PDCCH on
multiple beam pair links may be configured by higher layer
signaling or a MAC CE and/or is taken into consideration in the
search space design.
[0121] At least NR supports the indication of a spatial QCL
assumption between a DL RS antenna port(s) and a DL RS antenna
port(s) for the demodulation of a DL control channel. A candidate
signaling method for the beam indication of an NR-PDCCH (i.e., a
configuration method of monitoring an NR-PDCCH) is MAC CE
signaling, RRC signaling, DCI signaling, spec. transparent and/or
implicit method, and a combination of those signaling methods.
[0122] For the reception of a unicast DL data channel, NR supports
the indication of a spatial QCL assumption between a DL RS antenna
port and the DMRS antenna port of a DL data channel.
[0123] Information indicating an RS antenna port is indicated
through DCI (downlink grant). Furthermore, the information
indicates an RS antenna port QCLed with a DMRS antenna port. A
different set of DMRS antenna ports for a DL data channel may be
indicated as QCL with a different set of RS antenna ports.
[0124] Hereinafter, prior to detailed description of methods
proposed in this specification, contents directly/indirectly
related to the methods proposed in this specification are described
in brief below.
[0125] In next-generation communication, such as 5G, New Rat (NR),
as more communication devices require a greater communication
capacity, there emerges a need for enhanced mobile broadband
communication compared to the existing radio access technology
(RAT).
[0126] Furthermore, massive machine type communications (MTC)
providing various services anywhere and at any time by connecting
multiple devices and things is also one of important issues to be
taken into consideration in the next-generation communication.
[0127] Furthermore, the design or structure of a communication
system in which services and/or UEs sensitive to reliability and
latency are taken into consideration is also discussed.
[0128] As described above, the introduction of a next-generation
radio access technology (RAT) in which enhanced mobile broadband
(eMBB) communication, massive MTC (mMTC) and ultra-reliable and low
latency communication (URLLC) are taken into consideration is now
discussed. In this specification, a corresponding technology is
commonly called "new RAT(NR)", for convenience sake.
Self-Contained Slot Structure
[0129] In order to minimize latency of data transmission in the TDD
system, in a 5G New RAT (NR), a self-contained slot structure such
as FIG. 5 may be taken into consideration.
[0130] That is, FIG. 5 is a diagram showing an example of a
self-contained slot structure to which a method proposed in this
specification may be applied.
[0131] In FIG. 5, a deviant crease line area 510 indicates a
downlink (DL) control region and a black portion 520 indicates an
uplink (UL) control region.
[0132] A portion 530 not having indication may be used for downlink
data transmission or uplink data transmission.
[0133] The characteristic of such a structure is that DL
transmission and UL transmission are sequentially performed within
one slot and DL data can be transmitted and UL Ack/Nack can also be
transmitted and received within one slot.
[0134] Such a slot may be defined as a "self-contained slot."
[0135] That is, through such a slot structure, a base station can
reduce the time taken to perform data retransmission to a UE when a
data transmission error occurs and thus can minimize latency of the
final data delivery.
[0136] In such a self-contained slot structure, a base station and
a UE require a time gap for a process of switching from a
transmission mode to a reception mode or a process of switching
from the reception mode to the transmission mode.
[0137] To this end, in a corresponding slot structure, some OFDM
symbols when DL switches to UL are configured as a guard period
(GP).
[0138] Hereinafter, in this specification, a method of configuring
and/or indicating a physical resource block bundling size applied
to a downlink shared channel (e.g., a physical downlink shared
channel (PDSCH)) in relation to the transmission and reception of
downlink data is described below specifically.
[0139] PRB bundling may mean an operation of applying the same PMI
across a plurality of contiguous resource blocks (i.e., physical
resource block (PRB)) when data transmission is performed. In other
words, PRB bundling may mean that a UE assumes multiple resource
blocks on the frequency domain as one granularity for precoding in
order to perform PMI reporting and/or RI reporting.
[0140] Furthermore, PRB bundling for a downlink shared channel may
mean or refer to demodulation reference signal bundling (DMRS
bundling).
[0141] In this case, a system bandwidth or bandwidth part (BWP) may
be split based on the size (e.g., P' or P'.sub.BWP,i) of a
precoding resource block group (PRG). Each PRG may include
contiguous PRBs (or consecutive PRB). That is, a PRB bundling size
described in this specification may mean the size of a PRB or a PRG
value. Furthermore, a value (i.e., number) indicating a PRB
bundling size may mean the number of PRBs for corresponding PRB
bundling.
[0142] In this case, the setting of the size of PRB bundling needs
to be determined by taking into consideration a tradeoff between
the flexibility of precoders used in a PRB and quality of channel
estimation. Specifically, if the size of PRB bundling is configured
very large, a disadvantage of a flexibility aspect may be caused
depending on that the same precoder must be used in all PRBs. In
contrast, if the size of PRB bundling is configured very small,
complexity in channel estimation may increase. Accordingly, to set
the size of PRB bundling needs to be efficiently performed by
taking into consideration the above-described aspects.
[0143] In relation to the transmission of downlink data, in the NR
system, the value of a PRB bundling size may be configured
according to a method of selecting a specific value of preset
values (e.g., 1, 2, 4, 8, 16) as the value of a PRB bundling size
(hereinafter, a first method) and/or a method of setting the same
value as bandwidth (or PRBs) contiguously scheduled (i.e.,
allocated) with respect to a corresponding UE on the frequency
domain as the value of a PRB bundling size (hereinafter, a second
method). In this case, the first method and the second method may
be independently applied or the two methods may be mixed and
applied.
[0144] For example, if a PRB bundling size set is configured as {2,
4, UE allocation band (e.g., wideband)}, a PRB bundling size may be
selected (or determined) as any one value of 2 or 4 according to
the first method. Alternatively, in this case, the PRB bundling
size may be selected as a UE allocation band according to the
second method.
[0145] In relation to this, in the NR system, a method of
indicating a PRB bundling size through a 1-bit value is taken into
consideration. However, if only 1-bit information is used, only two
PRB bundling sizes can be indicated. Accordingly, in order to
indicate or set more PRB bundling sizes, an additional or
alternative method needs to be taken into consideration.
[0146] In order to configure and/or indicate efficient PRB bundling
by taking into consideration the above-described point, in this
specification, methods of configuring a PRB bundling size set
(hereinafter, first embodiment), methods of configuring a PRB
bundling size explicitly or implicitly (hereinafter, first
embodiment, second embodiment), methods of selecting an application
method for PRB bundling (i.e., first method and second method)
(hereinafter, third embodiment), and methods of applying RPB
bundling based on a resource allocation type (hereinafter, fourth
embodiment) are described.
[0147] Furthermore, a method of setting a PRB bundling size by
taking into consideration a case where information (e.g., system
information block (SIB), random access response (RAR), paging
information) on which a downlink shared channel (e.g., PDSCH) is
broadcasted is delivered (hereinafter, fifth embodiment) is also
described. For example, contents corresponding to the first
embodiment to the fourth embodiment independently of the fifth
embodiment may be assumed to be applied to common downlink data
and/or broadcast downlink data.
[0148] Hereinafter, the following embodiments have been
distinguished for convenience of description, and some elements or
characteristics of an embodiment may be included in another
embodiment or may be substituted with elements or characteristics
of another embodiment. For example, furthermore, the contents of a
PRB bundling size set described in the first embodiment hereinafter
may be applied to various embodiments of this specification in
common. Furthermore, for the configuration and/or indication of PRB
bundling, a method (e.g., a method for common downlink data)
described in the first embodiment to the fourth embodiment
hereinafter and a method (e.g., a method for broadcast downlink
data) described in the fifth embodiment may be applied
independently or in combination and vice versa.
FIRST EMBODIMENT
[0149] Hereinafter, in the first embodiment, a method of
determining or configuring a PRB bundling size set is described in
detail. In this case, the PRB bundling size set may mean a set
configured (or constructed) with candidate PRB bundling sizes which
may be selected as a PRB bundling size. For example, a PRB bundling
size set may be configured as {2, 4, UE allocation band, . . .
}.
[0150] In the present embodiment, by taking into consideration the
fact that a PRB bundling size indicator taken into consideration in
the NR system has 1 bit, a case where the number of elements of a
PRB bundling size set is 2 is assumed. However, the methods
described in the present embodiment may also be extended and
applied to a case where the PRB bundling size indicator is 1 bit or
more and the number of elements of a PRB bundling size set is 2 or
more.
[0151] Furthermore, the following methods have been distinguished
for convenience of description, and some elements or
characteristics of a method may be included in another method or
may be substituted with elements or characteristics corresponding
to another method.
Method 1)
[0152] A set configured with two PRB bundling sizes is determined
based on a system bandwidth, and a base station may be configured
to indicate a PRB bundling size to be applied by a corresponding UE
through downlink control information (DCI) using 1 bit. That is, a
configuration may be performed so that a PRB bundling size set is
determined as {bundling size A, bundling size B} based on a system
bandwidth and a PRB bundling size indicator belonging to DCI
indicates A or B.
[0153] For example, when a system bandwidth is 5 MHz or less, a PRB
bundling size set may be configured as {2, 4}. When a system
bandwidth is 5 MHz or more to 10 MHz or less, a PRB bundling size
set may be configured as {4, 8}. When a system bandwidth is 10 MHz
or more, a PRB bundling size set may be configured as {8, 16}. In
this case, the two size values defined within the set may be
selected through a 1-bit DCI field.
Method 2)
[0154] IN the case of the method 1, a PRB bundling size set may be
changed based on a system bandwidth. In contrast, a PRB bundling
size set may be configured (or changed) based on the receivable
and/or transmittable bandwidth of a UE determined based on the
radio frequency (RF) capability of the UE. In this case, the
receivable and/or transmittable bandwidth is configured with some
frequency domain of a system bandwidth, and may mean a frequency
domain in which a resource may be allocated to the corresponding UE
among the system bandwidth.
[0155] That is, a PRB bundling size set may be configured based on
a bandwidth in which a UE can actually perform transmission and
reception other than a system bandwidth. In this case, the UE may
need to previously report such capability information to a base
station.
[0156] In this specification, such a receivable and/or
transmittable bandwidth of a UE is denoted as a UE-specific
wideband. That is, the UE-specific wideband may mean a bandwidth on
a frequency domain which may be allocated (or scheduled) with
respect to a corresponding UE, and may be abbreviated as a
"wideband" with respect to the operation of a corresponding UE.
[0157] For example, when a UE-specific wideband is 5 MHz or less, a
PRB bundling size set may be configured as {2, 4}. When a
UE-specific wideband is 5 MHz or more to 10 MHz or less, a PRB
bundling size set may be configured as {4, 8}. When a UE-specific
wideband is 10 MHz or more, a PRB bundling size set may be
configured as {8, 16}. In this case, the two values defined within
the set may be selected through a 1-bit DCI field.
Method 3)
[0158] The above-described UE-specific wideband may be defined as
one or more bandwidth parts (hereinafter, BWP). A base station may
configure a single or multiple BWPs in a UE. In this case, the base
station may activated or deactivate a single or multiple BWPs of
configured BWPs, may notify the UE of this, and may allocate a
resource for the corresponding UE to only the active BWP.
[0159] A PRB bundling size set may be determined depending on that
the size of an active BWP (i.e., corresponding BWP) includes how
many RBs (i.e., PRBs) and the frequency bandwidth of a BWP by
taking into consideration such a point. For example, when the size
of an active BWP is 10 MHz or less, a PRB bundling size set may be
configured as {2, 4}. When the size of an active BWP is 10 MHz or
more, a PRB bundling size set may be configured as {8, 16}.
[0160] If an active BWP is multiple for a UE, a PRB bundling size
or a PRB bundling size set may be configured (or determined)
independently based on a BWP size for each active BWP.
Alternatively, when an active BWP is multiple, a PRB bundling size
or a PRB bundling size set may be configured based on the sum of
the RB sizes of active BWPs. For example, when a first BWP and a
second BWP are active, a PRB bundling size may be determined based
on the sum of the RB size of the first BWP and the RB size of the
second BWP. For another example, when the sum of BWPs is 10 MHz or
less, a PRB bundling size set may be configured as {2, 4}. When the
sum of BWPs is 10 MHz or more, a PRB bundling size set may be
configured as {8, 16}.
[0161] Alternatively, when an active BWP is multiple, a PRB
bundling size may be determined based on an average size of the
active BWPs, the smallest size value of the active BWPs, the
greatest size value of the active BWPs according to the method.
[0162] In this case, the two values defined within the set may be
selected through a 1-bit DCI field.
Method 4)
[0163] In the case of the method 1, a PRB bundling size set may be
changed based on a system bandwidth. In contrast, a PRB bundling
size set may be changed based on the size of a resource block group
(RBG).
[0164] For example, when the RBG size is 1 RB, a PRB bundling size
may be fixed to 1 RB. When the RBG size is 2 RBs, a PRB bundling
size set may be configured as {1, 2}. When the RBG size is 8 RBs, a
PRB bundling size set may be configured as {4, 8}. When the RBG
size is 16 RBs, a PRB bundling size set may be configured as {8,
16}.
[0165] In this case, the two values defined within the set may be
selected through a 1-bit DCI field.
Method 5)
[0166] In the case of the method 1, a PRB bundling size set may be
changed based on a system bandwidth. In contrast, a PRB bundling
size set may be changed based on the size of a subband in which a
precoding matrix indicator (PMI) (or rank indicator (RI)) is
reported or indicated.
[0167] For example, when the size of a subband is 1 RB, a PRB
bundling size may be fixed to 1 RB. When the size of a subband is 2
RBs, a PRB bundling size set may be configured as {1, 2}. When the
size of a subband is 8 RBs, a PRB bundling size set may be
configured as {4, 8}. When the size of a subband is 16 RBs, a PRB
bundling size set may be configured as {8, 16}.
[0168] When a UE reports a subband-based PMI for downlink, it may
be preferred that the PRB bundling size of actually transmitted
data increases according to the size of a subband because it is
assumed that the PMI is not changed within the corresponding
subband. Likewise, when a subband-based PMI is indicated through
DCI in uplink, it may be preferred that the PRB bundling size of
actually transmitted data increases based on the size of a subband
because it is assumed that the PMI is not changed within the
corresponding subband.
[0169] In this case, the two values defined within the set may be
selected through a 1-bit DCI field.
Method 6)
[0170] Furthermore, a PRB bundling size set may be changed based on
the size (e.g., RB) of resources actually allocated to a UE for
data transmission.
[0171] For example, when a resource allocated to a UE is 10 RBs or
less, a PRB bundling size set may be configured as {2, 4}. When a
resource allocated to a UE is 10 RBs or more to 20 RBs or less, a
PRB bundling size set may be configured as {4, 8}. When a resource
allocated to a UE is 20 RBs or more, a PRB bundling size set may be
configured as {8, 16}.
[0172] In this case, the two values defined within the set may be
selected through a 1-bit DCI field.
Method 7)
[0173] Furthermore, a PRB bundling size set may be changed based on
the number of DMRS (OFDM) symbols. In this case, the number of DMRS
symbols means the number of OFDM symbols to which a DMRS is mapped.
In this case, the number of DMRS symbols may be configured as 1, 2,
3, 4, etc. in various ways.
[0174] When the number of DMRS symbols is small, a PRB bundling
size set may be configured with small PRB bundling sizes. When the
number of DMRS symbols is large, DMRS density is sufficiently
large. Accordingly, a bundling size is configured small in the
frequency axis, and thus a base station can obtain a frequency
selective gain while finely changing precoding in the frequency
axis.
[0175] Alternatively, however, when the number of DMRS symbols is
large, a PRB bundling size set may be configured with large PRB
bundling sizes.
[0176] In this case, the two values defined within the set may be
selected through a 1-bit DCI field.
Method 8)
[0177] Furthermore, a PRB bundling size set may be changed based on
a seed value of a DMRS sequence. For example, a PRB bundling size
set may be differently defined based on an n scrambling ID (nSCID)
or virtual cell ID configuring the seed of a DMRS. In this case,
when the nSCIDs are 0 and 1, PRB bundling size sets may be
configured with {2, 4} and {8, 16}, respectively.
[0178] In this case, the two values defined within the set may be
selected through a 1-bit DCI field.
Method 9)
[0179] Furthermore, a PRB bundling size set may be changed based on
a DMRS configuration. A base station may notify a UE of a DMRS
configuration through higher layer signaling (RRC signaling), and
may indicate one of a DMRS configuration 1 and a DMRS configuration
2.
[0180] For example, PRB bundling size sets may be configured with
{2, 4} and {8, 16} with respect to the DMRS configuration 1 and the
DMRS configuration 2, respectively. In the case of the DMRS
configuration 1, it may be preferred that a set is configured with
small PRB bundling sizes because frequency density per port of a
DMRS is high. In the case of the DMRS configuration 2, it may be
preferred that a set is configured with large PRB bundling
sizes.
[0181] For more detailed example, a bundling size set may be
changed depending on a DMRS configuration Type 1 or a DMRS
configuration Type 2. In the case of Type 1, DMRSs maintain a
relatively dense interval because they are uniformly disposed per
two resource elements (REs). In contrast, in the case of Type 2,
DMRSs are not uniformly disposed and DMRS REs are spaced apart at
intervals of 3 REs. Accordingly, it may be preferred that a
bundling size set is configured as a small bundling size value when
Type 1 is used and a bundling size set is configured as a large
bundling size value when Type is used.
[0182] In this case, the two values defined within the set may be
selected through a 1-bit DCI field.
Method 10)
[0183] Furthermore, PRB bundling size set may be changed based on
the number of DMRS ports configured in a UE through DCI.
[0184] The number of DMRS ports is the same as the number of single
user (SU) layers. Accordingly, it may mean that if the number of
ports increases, the number of layers increases. Assuming that the
signal-to-noise ratio (SNR) is fixed, an increase in the number of
layers may mean that a multi-path increases. Furthermore, as the
multi-path increases, there is a good possibility that the
frequency selectivity of a channel may increase. If the frequency
selectivity of a channel is large, it may be preferred to obtain a
frequency selective gain by configuring a PRB bundling size
small.
[0185] Accordingly, when the number of DMRS ports configured in a
UE is many, a method of setting a PRB bundling size small may be
taken into consideration. For example, when the number of DMRS
ports is 2 or less, a PRB bundling size set may be configured as
{1, 2}. When the number of DMRS ports is 3 or more, a PRB bundling
size set may be configured as {2, 4}.
Method 11)
[0186] Furthermore, when PRB bundling (i.e., DMRS bundling) is
performed in the time axis, a frequency-axis bundling size set may
be changed based on a time-axis bundling size. If the time-axis
bundling size is large, scheduling flexibility can be increased by
configuring the frequency-axis bundling size small because DMRS
density indicating the same channel per RB is increased.
[0187] For example, if the time-axis bundling size is 1 slot, 2
slots, and 3 slots, frequency-axis bundling size sets may be
configured as {8, 16}, {2, 4}, and {1, 2}, respectively.
[0188] A PRB bundling size set may be determined through one of the
methods and a PRB bundling size may be indicated through DCI within
the corresponding set. Additionally, in order to further reduce DCI
overhead, a bundling size may be directly determined to be one
value without determining the bundling size set through the method.
Some contents related to this are described more specifically in
the description part of a second embodiment.
[0189] Furthermore, a bundling size set or a bundling size may be
determined through two or more of the above-described methods. For
example, the bundling size set or the bundling size may be
determined by a combination of the bundling size (e.g., method 11)
and the size of an active BWP (e.g., method 3) on the time
domain.
[0190] In the above-described method, in order to indicate the
bundling size, to use a bundling size indicator through (1-bit) DCI
is assumed. In this case, the corresponding DCI may be designed
through the following method.
[0191] First, one state (i.e., first state indicated by
corresponding DCI) may be defined as "PRG=RBG", and the remaining
states may be defined as "PRG=k*RBG." In this case, k may be
configured through higher layer signaling (e.g., RRC layer
signaling, MAC layer signaling) by a base station or may be
pre-defined as a specific value.
[0192] k may be configured as an integer greater than 1. In this
case, the PRB bundling size may be a multiple of a resource
allocation minimum unit. In this case, resources concatenated on
the frequency axis in an RBG unit among allocated resources may be
grouped into k RBGs and subjected to bundling. For example, if k is
2, an RBG is 2 RBs (i.e., PRG=4 RBs), and allocated resources are
{RB 1, RB 2, RB 3, RB 4, RB 7, RB 8}, bundling may be applied to
{RB 1, RB 2, RB 3, RB 4} and bundling may be applied to {RB 7, RB
8}. However, in this case, the PRG is 4, but an actual bundling
size is 4 RBs and two 2-RBs, a receiving stage needs to implement
and drive a channel estimator for the two bundling size.
[0193] Furthermore, k may be configured as 1/(aliquot of an RBG
size). In this case, the RBG may be configured as a multiple of the
size of PRB bundling. That is, one RBG may include one or more
PRGs. For example, if k is 1/2, an RBG is 4 RBs (i.e., PRG=2 RBs),
and allocated resources are {RB 1, RB 2, RB 3, RB 4, RB 7, RB 8, RB
9, RB 10}, bundling may be applied to each of {RB 1, RB 2}, {RB 3,
RB 4}, {RB 7, RB 8}, and {RB 9, RB 10}. In this case, since an
actual bundling size is always the same as the PRG, a receiving
stage may need to implement and drive a channel estimator for one
bundling size.
[0194] Next, one state may be defined as "PRG=k*RBG", and the
remaining states may be defined as "PRG=1PRB." In this case, k may
be configured through higher layer signaling (e.g., RRC layer
signaling, MAC layer signaling) by a base station or may be
pre-defined as a specific value.
[0195] In this case, "PRG=1PRB" may mean a configuration for
performing precoding cycling for open loop (or semi-open loop) MIMO
transmission in a 1 PRB unit. In this case, the precoding cycling
may mean an operation of sequentially performing precoding while
changing precoders.
[0196] Alternatively, if an open loop (or semi-open loop) MIMO
transmission scheme has been configured by a base station, a PRG
size may be disregarded and a UE may assume "PRG=1PRB."
[0197] A set of bundling sizes (i.e., PRB bundling sizes) may be
configured or determined through the above-described methods, and a
specific bundling size belonging to the set may be indicated
through DCI.
SECOND EMBODIMENT
[0198] Unlike in the above-described methods, a PRB bundling size
(i.e., DMRS bundling size) may be directly determined by a
DMRS-related parameter and/or a specific parameter. In this case,
there is an effect in that DCI overhead can be reduced because
indication by DCI is not performed. In the present embodiment,
related methods are described in detail.
[0199] Hereinafter, the following embodiments have been
distinguished for convenience of description, and some elements or
characteristics of an embodiment may be included in another
embodiment or may be substituted with elements or characteristics
of another embodiment.
Method 1)
[0200] A PRB bundling size may be changed (or set) based on the
number of DMRS (OFDM) symbols. In this case, the number of DMRS
symbols means the number of OFDM symbols to which a DMRS is mapped.
In this case, the number of DMRS symbols may be configured as 1, 2,
3, 4 in various ways.
[0201] When the number of DMRS symbols is small, a PRB bundling
size may have a small value. When the number of DMRS symbols is
large, DMRS density is sufficiently increased. Accordingly, a base
station can obtain a frequency selective gain by configuring a
bundling size small in a frequency axis and finely changing
precoding in the frequency axis.
[0202] Alternatively, however, if the number of DMRS symbols is
large, the PRB bundling size may have a large value.
Method 2)
[0203] Furthermore, a PRB bundling size may be changed (or set)
based on a seed value of a DMRS sequence. For example, a PRB
bundling size set may be differently defined based on an n
scrambling ID (nSCID) or a virtual cell ID configuring the seed of
a DMRS. In this case, when the nSCIDs are 0 and 1, the PRB bundling
sizes may have 2 and 4, respective.
Method 3)
[0204] Furthermore, a PRB bundling size may be changed (or set)
based on a DMRS configuration. A base station may notify a UE of a
DMRS configuration through higher layer signaling, and may indicate
one of a DMRS configuration 1 and a DMRS configuration 2.
[0205] For example, the PRB bundling sizes may have 2 and 4,
respectively, with respect to the DMRS configuration 1 and the DMRS
configuration 2. It may be preferred that a small PRB bundling size
is configured because frequency density per each port of a DMRS is
high in the case of the DMRS configuration 1 and a large PRB
bundling size is configured in the case of the DMRS configuration 2
and vice versa.
[0206] For more detailed example, a bundling size may be changed
based on a DMRS configuration Type 1 or a DMRS configuration Type
2. In the case of Type 1, DMRSs maintain a relatively dense
interval because they are uniformly disposed every two resource
elements (REs). In contrast, in the case of Type 2, DMRSs are not
uniformly disposed and DMRS REs are spaced apart at intervals of 3
REs. Accordingly, it may be preferred that a bundling size is
configured small when Type 1 is used and a bundling size is
configured large when Type is used.
[0207] In addition to the above-described methods, a PRB bundling
size may be determined based on a system bandwidth, a partial
bandwidth, an RBG size, a subband size, the size of resources
actually allocated to a UE for data transmission, a UE-specific
wideband and/or the size of an active BWP similar to the first
embodiment. For example, if a corresponding value is within a
specific range (e.g., range i), a bundling size may be configured
to be determined as an xi value. In this case, xi may be defined as
a specific value within a bundling size set (e.g., {1, 2, 4, 8,
16}).
THIRD EMBODIMENT
[0208] Furthermore, in relation to PRB bundling, the first method
and the first method may be applied as described above. In other
words, a value of the PRB bundling size may be configured according
to the method of selecting a specific value of pre-configured
values (e.g., 1, 2, 4, 8, 16) (first method) and/or the method of
setting the value of the PRB bundling size as a specific frequency
allocated to a corresponding UE (e.g., the same value as a
bandwidth or PRBs contiguously scheduled with respect to a
corresponding UE) (second method).
[0209] In this case, the selection and application of the first
method or second method may be (implicitly) determined according to
the following methods. Hereinafter, the following embodiments have
been distinguished for convenience of description, and some
elements or characteristics of an embodiment may be included in
another embodiment or may be substituted with elements or
characteristics of another embodiment.
Method 1)
[0210] First, the first method or the second method may be
determined based on a system bandwidth, a partial bandwidth, an RBG
size, a subband size, the size of resources actually allocated to a
UE for data transmission, a UE-specific wideband and/or the size of
an active BWP.
[0211] For example, a configuration may be performed so that the
second method is applied when a corresponding value exceeds a
specific threshold value and the first method is applied if
not.
Method 2)
[0212] Alternatively, the first method or the second method may be
determined according to a use scenario (use case) or a
communication environment. In the mmWave or indoor environment, it
may be preferred that the second method is applied because the
possibility that an environment not having great channel
selectivity will be supported is sufficient.
[0213] Accordingly, a configuration may be performed so that a PRB
bundling operation is performed according to the second method if
the mmWave or indoor environment is configured and the first method
is applied in the remaining environments. Alternatively, a
configuration may be performed through higher layer signaling
(e.g., RRC layer signaling, MAC layer signaling) so that the first
method and the second method are selectively applied in the
remaining environments.
Method 3)
[0214] Alternatively, a method of selecting the first method or
second method based on the size of contiguous resources
concatenated in the frequency axis among resources allocated to a
UE and applying the selected method to PRB bundling may also be
taken into consideration. That is, when resources (e.g., contiguous
PRBs) contiguous on the frequency axis are allocated to the UE, the
first method or second method may be selected based on the size of
the corresponding contiguous resources.
[0215] For example, when the size of contiguous resources allocated
to the UE is "N" or more, a PRB bundling size may be determined
using the second method with respect to the corresponding
resources. A PRB bundling size may be determined using the first
method with respect to the remaining resources (i.e., contiguous
resources having a size less than "N"). In this case, "N" may be
previously defined or may be (previously) set through higher layer
signaling (e.g., RRC layer signaling) or physical layer signaling
by a base station.
[0216] In other words, when the size of resources contiguously
allocated to a UE is greater than a pre-configured value, the
bundling size of a downlink channel may be configured as the size
of a frequency resource region allocated to the UE. In contrast,
when the size of resources contiguously allocated to a UE is
smaller than a pre-configured value, a bundling size may be
configured as a value indicating a specific number of PRBs. In this
case, the value indicating a specific number of PRBs may be a value
included in a previously configured bundling size set according to
the method.
[0217] For more detailed example, if the size of contiguous
resources of resources allocated to a UE is "N" or more, the second
method may be applied and the first method may be applied to the
remaining allocated resources.
[0218] In this case, although the bundling size of the first method
has been indicated through DCI or the bundling size has been
indicated according to a specific rule, when the size of contiguous
resources is "N" or more (i.e., resources having a size of "N" or
more), the second method may be exceptionally applied. For example,
when "N" is 4, the bundling size of the first method is 2, and
resources allocated to a UE are {RB 1, RB 2, RB 3, RB 6, RB 7, RB
8, RB 9}, the first method may be applied to {RB 1, RB 2, RB 3}
(i.e., bundling size=2), {RB 1, RB 2} may be bundled, and {RB 3}
may be bundled. In this case, the corresponding UE may assume that
all the resources are bundled by applying the second method to {RB
6, RB 7, RB 8, RB 9}.
Method 4)
[0219] Alternatively, if the size of contiguous resources of
resources allocated to a UE is N or more, the corresponding UE may
assume that all the resources allocated thereto are bundled for
each contiguous resource group by applying the second method to all
the allocated resources. For example, if allocated resources are
{RB 1, RB 2, RB 3, RB 6, RB 7, RB 8, RB 9}, bundling for {RB 1, RB
2, RB 3} (i.e., contiguous allocation resource group 1) may be
assumed and bundling for {RB 6, RB 7, RB 8, RB 9} (i.e., contiguous
allocation resource group 2) may be assumed.
FOURTH EMBODIMENT
[0220] Furthermore, an operation method of PRB bundling may be
configured (or determined) based on a resource allocation type.
[0221] For reference, in the case of the existing LTE system, a
resource allocation Type 0 (hereinafter Type 0), a resource
allocation Type 1 (hereinafter Type 1) and/or a resource allocation
Type 2 (hereinafter Type 2) may be defined. In this case, Type 0
may mean a method of allocating resources in a PRG unit.
Furthermore, Type 1 may mean a method of allocating resources in a
PRB unit within a subset configured with contiguous PRGs all
resources that may be allocated. Furthermore, Type 2 may mean a
method of scheduling contiguous RBs by providing notification of an
RB where resource allocation starts and the number of allocated
PRs.
[0222] In particular, Type 2 may include a localized method and a
distributed method. In this case, in the case of the distributed
method, a logical RB may be mapped in a physical RB through an
interleaver, and thus actually allocated RBs may be uniformly
disposed in a wide frequency band.
[0223] In the NR system, in cyclic prefix (CP) OFDM-based downlink
(DL)/uplink (UL), to support the Type 0 and Type 2 methods is taken
into consideration. In discrete Fourier transform-spread (DFT-s)
OFDM-based uplink, to support the localized method of Type 2 is
taken into consideration.
[0224] In Type 0, a method of fixing and operating a bundling unit
(i.e., the above-described PRG) in an RBG unit may be taken into
consideration because resource allocation is performed in an RBG
unit.
[0225] Alternatively, a bundling unit may be configured as a
multiple of an RBG unit, and a base station may configure a
multiple value with respect to a UE.
[0226] Alternatively, if the RBG unit is "N" RB or less, the RBG
and the bundling unit are identically set. If not, "PRG=RBG/k" may
be configured. In this case, k is an aliquot of the RBG and may be
configured by a base station or fixed as a pre-defined value. The
reason for this is that when the RBG unit is large, if the PRG and
the RBG are identically set, precoding scheduling restrictions are
increased, performance degradation occurs in an environment having
great frequency selectivity, implementation complexity may increase
because channel estimation of a UE is performed on many RBs at the
same time.
[0227] Alternatively, a bundling unit may be configured so that the
RBG unit is configured as a multiple of the bundling unit, and a
base station may configure a corresponding multiple value with
respect to a UE.
[0228] In Type 1, resource allocation may be performed in an RB
unit, and PRGs to which resources may be allocated may have been
distributed. Accordingly, a PRG does not need to be a multiple of
an RBG, and "PRG=RBG" may be fixed or the PRG may be defined as
"PRG=1 RB" so that it is identical with a resource allocation
unit.
[0229] In the localized method of Type 2, in relation to bundling
size setting, only the second method may be limited to be used. In
the case of the localized method of Type 2, it may be preferred
that a bundling size may be configured as all contiguous RBs (i.e.,
the second method) identically with a resource allocation unit
because the contiguous RBs are allocated. However, the
corresponding method may have a disadvantage in that a frequency
selective gain is not obtained in the localized method of Type
2.
[0230] Accordingly, in the localized method of Type 2, the first
method and the second method may be selectively used. In the
remaining types, only the first method may be limited to be
used.
[0231] In contrast, in the distributed method of Type 2, it may be
preferred that a bundling size is configured as 1 RB unit because
resources are allocated in a non-contiguous 1 RB unit.
FIFTH EMBODIMENT
[0232] In the case of a downlink shared channel (e.g., PDSCH)
(hereinafter BC downlink shared channel) on which broadcast (BC)
information (e.g., system information block (SIB), random access
response (RAR), paging information) is transmitted, multiple UEs
may receive data through the downlink shared channel at the same
time. Accordingly, it is necessary to deliver (or configure)
information on the PRB bundling of a BC downlink shared channel
using a method different from that of a common unicast downlink
shared channel.
[0233] In the above-described other embodiments, the method of
configuring and indicating PRB bundling for a downlink shared
channel for the transport of common data (or not-broadcasted data)
has been described. In contrast, in the present embodiment, a
method of configuring and indicating PRB bundling for a BC downlink
shared channel for the transport of broadcasted data is described
in detail.
[0234] In general, since a master information block (MIB) delivered
through a broadcast channel (e.g., physical broadcast channel
(PBCH)) includes control information received by all UEs within a
cell, a method of designating a PRB bundling method (i.e., first
method or second method) through the MIB or indicating a PRB
bundling size may be taken into consideration. Reception
probability for bundling information may be high because storing
channel coding is applied to the MIB. However, to (dynamically)
change bundling information may be difficult because the MIB is
transmitted periodically. Alternatively, such information may be
indicated in common DCI including information for decoding a BC
downlink shared channel. Alternatively, in the case of a BC
downlink shared channel that delivers SIB information, bundling
information is delivered through the proposed method, and bundling
information for the remaining BC downlink shared channels may be
configured to be indicated in a SIB.
[0235] In this case, the first method and the second method related
to the above-described PRB bundling provide scheduling flexibility
in the unicast environment, but only one of the two methods may be
sufficient with respect to the broadcast environment. The amount of
control information can be reduced through such a method.
[0236] Accordingly, the bundling method of a BC downlink shared
channel may be configured to be fixed to one (i.e., the first
method or the second method) of the two methods. Alternatively, the
first method or the second method may be configured to be assumed
by default with respect to a BC downlink shared channel before
separate signaling is performed.
[0237] In view of broadcast, multiple UEs receive data in common.
In this case, the channel situation (in particular, frequency
selectivity) of each UE may be different. For example, a
line-of-sight (LoS) UE may have low frequency selectivity.
[0238] In the case of unicast, a dynamic indication method may be
used to optimize a bundling size based on the channel situation of
each UE. In the case of broadcast, however, it may be difficult to
set a bundling size so that it is optimized for the channel
situation of each UE. Accordingly, a method of fixing a bundling
size (i.e., RPB bundling size) to a specific value in the case of
broadcast may be taken into consideration. That is, the BC bundling
size of a downlink shared channel may be pre-defined as a specific
value. Accordingly, there is an effect in that overhead of control
information can be reduced.
[0239] To define the BC bundling size of a downlink shared channel
as a specific value may be performed according to any one of the
following methods (or a combination of them). Hereinafter, the
following embodiments have been distinguished for convenience of
description, and some elements or characteristics of an embodiment
may be included in another embodiment or may be substituted with
elements or characteristics of another embodiment.
Method 1)
[0240] First, in the case of a BC downlink shared channel, a large
majority of UEs perform decoding and multiple UEs must receive data
with high reliability. By taking this into consideration, it may be
preferred to set small a bundling size fixed to a specific value.
For example, the bundling size of a BC downlink shared channel may
be configured as a small value, such as 2 (or 1).
[0241] When the bundling size is small, reliability can be improved
because spatial diversity can be obtained by changing a precoder in
a small RB unit. Furthermore, if only the DMRS configuration Type 1
is used in a BC downlink shared channel, a gain attributable to
bundling may not be great because DMRS REs are densely disposed in
the frequency axis. Furthermore, an increase in the successful
number of decoding attributable to improved channel estimation
accuracy may not be great because the modulation order of a BC
downlink shared channel may be configured as a low modulation
order, such as quadrature phase shift keying (QPSK).
Method 2)
[0242] In contrast, in order to improve channel estimation
performance, the BC bundling size of a downlink shared channel may
be fixed to a large value (e.g., 4). The accuracy of channel
estimation can be increased because the number of DMRS REs used for
channel estimation is increased as the bundling size increases.
Accordingly, the corresponding method has advantages in that
channel estimation for a BC downlink shared channel can be
performed stably and the decoding success probability can be
enhanced based on accurate channel estimation.
Method 3)
[0243] Alternatively, the bundling size of a BC downlink shared
channel may be previously agreed (or defined) between a base
station and a UE so that the bundling size is determined based on a
specific environment or numerology. For example, in an environment
using an indoor small cell or a carrier frequency of 6 GHz or more,
frequency selectivity may be low because a line-of-sight (LoS) is
strong and the influence of a scatter is small. In an environment
having low frequency selectivity, it may be efficient to obtain a
spatial diversity gain by configuring the bundling size as a small
value because a gain attributable to bundling is small although the
bundling size is increased. Furthermore, multiple time domain
bundling may be performed within one slot using a front-load DMRS
and/or an additional DMRS.
[0244] Accordingly, a method of fixing the bundling size to a small
value in such an environment and fixing the bundling size to a
large value in other environments may be taken into
consideration.
Method 4)
[0245] Alternatively, the BC bundling size of a downlink shared
channel may be agreed (or defined) between a base station and a UE
so that the BC bundling size is determined based on a system
bandwidth. That is, the bundling size may be configured large as a
system bandwidth increases. In this case, a method of determining
the bundling size by taking into consideration both the system
bandwidth and the numerology may be taken into consideration.
[0246] For example, a configuration may be performed so that the
bundling size is fixed to a small value in 6GHz or more and the
bundling size is determined based on a system bandwidth
otherwise.
[0247] The BC bundling size of a downlink shared channel (PRB
bundling size) may be pre-defined or set as a specific value
through the methods.
[0248] Furthermore, various embodiments of the present invention,
in relation to the bundling size of a unicast downlink shared
channel, a cell-specific default bundling size, the candidates of a
bundling size or a bundling method (e.g., the first method and/or
the second method) may be indicated through remaining minimum
system information (RMSI). Thereafter, a method of updating a
bundling size or type through UE-specific signaling or selecting
one of the candidates of a bundling size may also be taken into
consideration.
[0249] Furthermore, in various embodiments of the present
invention, in the case of a high speed scenario (in particular,
when small resource allocation is performed), to set the PRG to 1
may provide a diversity gain according to precoder cycling.
Furthermore, in the TDD system having downlink (DL)/uplink (UL)
channel reciprocity, this can support frequency selective
scheduling having single PRB granularity.
[0250] Furthermore, in various embodiments of the present
invention, for dynamic switching between the first method and the
second method, a 1-bit DCI field may be used. In this case, in the
case of the first method, a PRG may be determined based on an RBG.
In this case, when DCI payload and scheduling flexibility are taken
into consideration, at least RBG may need to support {1, 2, 4}.
Accordingly, if the first method is configured by the 1-bit DCI
field, the PRG and the RBG may be determined identically. For
example, if the RBG is greater than 4 like 8 or 16, the PRG may be
determined as a maximum value (i.e., 4).
[0251] However, in the first method, if {1} is excluded as a
candidate value of a PRG and only {2, 4} is supported, the above
example may be changed as follows. For example, when the RBG is {2,
4}, the PRG may be the same as the RBG. When the RBG is {8, 16},
the PRG may be 4. When the RBG is {1}, the PRG may be 2. That is,
if the same PRG as the RBG size is present, the PRG may be
configured identically with the RBG. When the RBG is greater than a
maximum value of the PRG, the PRG may be configured as a PRG
maximum value. When the RBG is smaller than a minimum value of the
PRG, the PRG may be configured as a PRG minimum value.
[0252] FIG. 6 illustrates an operational flowchart of a user
equipment transmitting and receiving data in a wireless
communication system to which a method proposed in this
specification may be applied. FIG. 6 is merely for convenience of
description and does not limit the scope of the present
invention.
[0253] Referring to FIG. 6, a corresponding UE and a base station
may perform the method(s) described in the above-described
embodiments of this specification. In particular, the corresponding
UE and the base station may support the methods described in the
first embodiment, third embodiment and fifth embodiment. In FIG. 6,
a redundant and detailed description of the above-described
contents is omitted.
[0254] First, the UE may receive downlink control information (DCI)
from a base station (step S605).
[0255] Thereafter, the UE may receive downlink data from the base
station through a downlink shared channel configured based on the
received downlink control information.
[0256] In this case, when the downlink data is broadcasted, the
bundling size of the downlink shared channel may be configured as a
pre-defined value (e.g., 2 PRBs).
[0257] In contrast, when the downlink data is not broadcasted, the
bundling size of the downlink shared channel may be configured as a
specific number of physical resource blocks or the size of a
frequency resource region allocated to the UE. In this case, a
value indicating the specific number of physical resource blocks
may be included in a bundling size set previously configured for
the downlink shared channel. In this case, when the size of the
frequency resource region is greater than a value (e.g., an N value
in the method 3 of the third embodiment) pre-configured for the UE,
the bundling size of the downlink shared channel may be configured
as the size of the frequency resource region. In this case, the
frequency resource region allocated to the UE may be configured
with contiguous PRBs in the frequency axis.
General Apparatus to which the Present Invention May Be Applied
[0258] FIG. 7 illustrates a block diagram of a wireless
communication apparatus according to an embodiment of the present
invention.
[0259] Referring to FIG. 7, the wireless communication system
includes an eNB (or network) 710 and a UE 720.
[0260] The eNB 710 includes a processor 711, memory 712 and a
communication module 713.
[0261] The processor 711 implements the functions, processes and/or
methods proposed in FIGS. 1 to 6. The layers of a wired/wireless
interface protocol may be implemented by the processor 711. The
memory 712 is connected to the processor 711 and stores various
types of information for driving the processor 711. The
communication module 713 is connected to the processor 711 and
transmits and/or receives wired/wireless signals.
[0262] The communication module 713 may include a radio frequency
(RF) unit for transmitting/receiving radio signals.
[0263] The UE 720 includes a processor 721, memory 722 and a
communication module (or RF unit) 723. The processor 721 implements
the functions, processes and/or methods proposed in FIGS. 1 to 6.
The layers of a radio interface protocol may be implemented by the
processor 721. The memory 722 is connected to the processor 721 and
stores various types of information for driving the processor 721.
The communication module 723 is connected to the processor 721 and
transmits and/or receives radio signals.
[0264] The memory 712, 722 may be positioned inside or outside the
processor 711, 721 and may be connected to the processor 711, 721
by various well-known means.
[0265] Furthermore, the eNB 710 and/or the UE 720 may have a single
antenna or multiple antennas.
[0266] FIG. 8 illustrates a block diagram of a communication
apparatus according to an embodiment of the present invention.
[0267] In particular, FIG. 8 is a diagram illustrating the UE of
FIG. 7 more specifically.
[0268] Referring to FIG. 8, the UE may include a processor (or
digital signal processor (DSP) 810, an RF module (or the RF unit)
835, a power management module 805, an antenna 840, a battery 855,
a display 815, a keypad 820, memory 830, a subscriber
identification module (SIM) card 825 (this element is optional), a
speaker 845 and a microphone 850. The UE may further include a
single antenna or multiple antennas.
[0269] The processor 810 implements the functions, processes and/or
methods proposed in FIGS. 1 to 6. The layers of a radio interface
protocol may be implemented by the processor 810.
[0270] The memory 830 is connected to the processor 810 and stores
information related to an operation of the processor 810. The
memory may be positioned inside or outside the processor 810 and
may be connected to the processor 810 by various well-known
means.
[0271] A user inputs command information, such as a telephone
number, by pressing (or touching) a button of the keypad 820 or
through voice activation using the microphone 850, for example. The
processor 810 receives such command information and performs
processing so that a proper function, such as making a phone call
to the telephone number, is performed. Operational data may be
extracted from the SIM card 825 or the memory. Furthermore, the
processor 810 may recognize and display command information or
driving information on the display 815, for convenience sake.
[0272] The RF module 835 is connected to the processor 810 and
transmits and/or receives RF signals. The processor 810 delivers
command information to the RF module 835 so that the RF module 835
transmits a radio signal that forms voice communication data, for
example, in order to initiate communication. The RF module 835
includes a receiver and a transmitter in order to receive and
transmit radio signals. The antenna 840 functions to transmit and
receive radio signals. When a radio signal is received, the RF
module 835 delivers the radio signal so that it is processed by the
processor 810, and may convert the signal into a baseband. The
processed signal may be converted into audible or readable
information output through the speaker 845.
[0273] The aforementioned embodiments are achieved by a combination
of structural elements and features of the present disclosure in a
predetermined manner. Each of the structural elements or features
should be considered selectively unless specified separately. Each
of the structural elements or features may be carried out without
being combined with other structural elements or features. In
addition, some structural elements and/or features may be combined
with one another to constitute the embodiments of the present
disclosure. The order of operations described in the embodiments of
the present disclosure may be changed. Some structural elements or
features of one embodiment may be included in another embodiment,
or may be replaced with corresponding structural elements or
features of another embodiment. Moreover, it is apparent that some
claims referring to specific claims may be combined with another
claims referring to the other claims other than the specific claims
to constitute the embodiment or add new claims by means of
amendment after the application is filed.
[0274] The embodiments of the present disclosure may be achieved by
various means, for example, hardware, firmware, software, or a
combination thereof. In a hardware configuration, the methods
according to the embodiments of the present disclosure may be
achieved by one or more application specific integrated circuits
(ASICs), digital signal processors (DSPs), digital signal
processing devices (DSPDs), programmable logic devices (PLDs),
field programmable gate arrays (FPGAs), processors, controllers,
microcontrollers, microprocessors, etc.
[0275] In a firmware or software configuration, the embodiments of
the present disclosure may be implemented in the form of a module,
a procedure, a function, etc. Software code may be stored in the
memory and executed by the processor. The memory may be located at
the interior or exterior of the processor and may transmit data to
and receive data from the processor via various known means.
[0276] It will be apparent to those skilled in the art that various
modifications and variations can be made in the present disclosure
without departing from the spirit or scope of the inventions. Thus,
it is intended that the present disclosure covers the modifications
and variations of this invention provided they come within the
scope of the appended claims and their equivalents.
INDUSTRIAL APPLICABILITY
[0277] The method of transmitting and receiving data in a wireless
communication system of the present invention has been illustrated
as being applied to the 3GPP LTE/LTE-A system, 5G but may be
applied to various wireless communication systems.
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